> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstresonance.io/llms.txt
> Use this file to discover all available pages before exploring further.

# ION Actions

> Validation rules that allow, block, or warn on a change when an ION event fires.

**ION Actions** are validation rules you write to enforce your own business logic in ION. An action is triggered by an event, such as creating an issue, completing a run step, or changing a procedure's status. When triggered, it reads the data involved and can allow the change, block it with a message, or surface a non-blocking warning.

## Related

* [Subscribe to notifications](/automate-with-ion/notifications/subscribe-to-notifications) for the simpler, native alerting layer
* [API reference](/api-reference) for programmatic action management
* [Webhooks](/api-reference/guides/webhooks) for calling out to external systems